/*
    This file is part of the substandard lisp implementation of Standard Lisp
    Copyright (C) 2011 Nicky Nickell

    substandard lisp is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

std_errorset = (a, env) ->
  u = a[0]
  msgp = a[1]
  tr = a[2]
  
  try
    return u.evaluate(env)
  catch e
    switch e.type
      when ERROR_INTERNAL
        if msgp isnt NIL
          env.variables.get('ERROUT*').write("***** #{e.mess.prin2()}")
        env.variables.set('EMSG*', e.mess)
        return NIL
      when ERROR_USER
        if msgp isnt NIL
          env.variables.get('ERROUT*').write("++++ #{e.value.prin2()} #{e.mess.prin2()}")
        env.variables.set('EMSG*', e.mess)
        return e.value
      when ERROR_GO, ERROR_RETURN
        throw e
      else
        throw e

/*---
name: errorset
arity: 3
rest: false
ftype: FTYPE_EXPR

argument-types:
  - CLASS_ANY
  - TYPE_BOOLEAN
  - TYPE_BOOLEAN

doc: |
  explaining what errorset is / how it is used!

tests: |

...*/
